采用波长1064 nm的脉冲光纤激光器对KMN钢表面环氧有机硅漆进行清洗，以搭接率和能量密度作为变量，使用单次清洗和二次清洗两种工艺，探究了激光清洗参数对基体表面粗糙度和重新涂覆漆层附着力的影响，并分析了清洗后基体表面维氏硬度随清洗参数变化的规律和原因。研究结果表明，在能量密度为4.73 J/cm²和搭接率为0.4~0.7参数下，单次清洗漆层难以完全清除干净，需进行二次清洗以去除残余漆块。当第二次清洗搭接率小于0.5且能量密度小于4.25 J/cm²时，基体表层金属熔化导致表面粗糙度小幅下降，但在基体粗糙度高于0.6时，不会影响重新涂覆漆层的附着力。当第二次清洗搭接率大于0.5且能量密度大于4.25 J/cm²时，基材表面熔化和重新凝固引入拉应力，并发生相变和晶粒长大，导致清洗后试样表面硬度低于基材硬度。

A pulsed fiber laser with a wavelength of 1064 nm is used to clean the epoxy silicone paint on the surface of KMN steel. The overlap ratio and energy density are selected as variable parameters, and the samples are cleaned in one pass and two passes under different parameters. The effects of laser cleaning parameters on the substrate surface roughness and the adhesion of the recoating paint are investigated, as well as the trends and reasons for the variation of substrate surface Vickers hardness with the cleaning parameters. The results show that with an energy density of 4.73 J/cm² and an overlap ratio of 0.4-0.7, the paint cannot be removed by a single pass cleaning, and a second pass cleaning is required to remove the residual paint chips. When the overlap ratio of the second cleaning is less than 0.5 and the energy density is less than 4.25 J/cm², the substrate surface melting causes a minor decrease in the surface roughness, but the adhesion of the recoating paint is unaffected at surface roughness of more than 0.6. When the overlap ratio of the second cleaning is greater than 0.5 and the energy density is greater than 4.25 J/cm², the surface tensile stress caused by melting and solidification of the substrate surface, as well as the phase change and grain growth in the heat-affected zone, resulting in a lower hardness on the substrate surface compared to the interior.